Current switching circuit
First Claim
1. A current switching circuit with current boosting for operation across a wider range of frequencies, the current switching circuit comprising:
- a differential current switching circuit comprising;
a first transistor configured to receive a switching signal and to provide an output current to an output node;
a second transistor configured to receive an inverted switching signal, the first transistor and the second transistor coupled to each other at a tail node; and
a first current source configured to provide an input current to the tail node; and
a third transistor coupled to the tail node, wherein the third transistor is configured to provide a boost current from a second current source to the tail node while the first transistor is off.
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Accused Products
Abstract
A wide range differential current switching circuit can operate across a wide range of input currents and across a broad range of frequencies. A first differential current source can include a first transistor and a second transistor. The first transistor receives a switching signal and provides an output current and at output node. The second transistor receives an inverted switching signal, the first transistor and the second transistor coupled to each other at a tail node. A current source provides an input current to the tail node. A third transistor can provide a boost current to the tail node while the first transistor is off.
16 Citations
20 Claims
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1. A current switching circuit with current boosting for operation across a wider range of frequencies, the current switching circuit comprising:
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a differential current switching circuit comprising; a first transistor configured to receive a switching signal and to provide an output current to an output node; a second transistor configured to receive an inverted switching signal, the first transistor and the second transistor coupled to each other at a tail node; and a first current source configured to provide an input current to the tail node; and a third transistor coupled to the tail node, wherein the third transistor is configured to provide a boost current from a second current source to the tail node while the first transistor is off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A current switching circuit for providing an output current at an output node, the current switching circuit comprising:
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a first differential current switching circuit comprising a first current source and configured to alternate between passing an input current through a first transistor and through a second transistor, wherein the first transistor is configured to provide the output current; and a second differential current switching circuit comprising a second current source and configured to alternate between passing a boost current through a third transistor and through a fourth transistor, wherein the second differential current circuit is configured to bias the second transistor by passing the boost current through the third transistor while the input current is being passed through the second transistor. - View Dependent Claims (12, 13, 14, 15, 20)
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16. A method for increasing differential circuit switching speeds, the method comprising:
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causing an input current from a first current source of a first differential current switching circuit to switch between flowing to an output node of the first differential current switching circuit and flowing away from the output node of the first differential current switching circuit; and causing a boost current from a second current source of a second differential current switching circuit to switch between; biasing the first differential current switching circuit while the input current is flowing to first differential current switching circuit; and flowing away from the first differential current switching circuit; wherein biasing the first differential current switching circuit causes a switching speed of the first differential current switching circuit to be increased. - View Dependent Claims (17, 18, 19)
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Specification